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Smalltalk is an object-oriented programming language and family of languages. It is notable among object-oriented languages in that "everything is an object"; even function invocation is achieved by way of objects called "messages". Because of this, and that one of its creators is Alan Kay (the originator of the term "object-oriented programming"), it is considered by some to be one of the definitive examples of the paradigm. The original Smalltalk language, Smalltalk-80, is no longer in mainstream use, but several descendants carry on its legacy with small but dedicated communities of developers and users. Among these are [[http://squeak.org|Squeak]], whose Morphic UI toolkit was the source of some of the ideas in Factor's [[Factor/UI]], and [[https://pharo.org|Pharo]], a fork of Squeak which is likely the most popular and advanced Smalltalk environment in the present day.
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